First Day Cover commemorating Niels Bohr and the 50th anniversary of Bohr's atom theory
Stamps depict Niels Bohr, the equation for the Bohr frequency condition (an equation relating to light frequency and electrons), and a diagram of the Bohr model of a hydrogen atom.
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Viggo Bang. “First Day Cover Commemorating Niels Bohr and the 50th Anniversary of Bohr's Atom Theory.” Denmark, November 21, 1963. Witco Stamp Collection, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/2v23vt53q.
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